Automatic throttle governor



Nov. 13, 11923. L47323 H. A. LEWIS AUTOMATIC THROTTLE GOVERNOR Filed March 21. 1921 LTLUQMQE Herman fll gm atented Nov, 113, W23. 1

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AUTQMATIC THROTTLE GOVERNOR.

Application filed March 21, 11921. Serial 180. 454,310.

To all. wlwm it may concern:

Be it known that l, HERMAN A. Lewis, a citizen of the United States of America, residing at Carson City in the county of Montcalm and State of Michigan, have invented certain new and useful Improvements in Automatic Throttle Governors; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to improvements in automatic throttle governors and more particularly. to such governors to be applied to the throttle valves of internal combustion engines to govern the speed of such engines by action of the explosive chargepassing through said valves.

Although this device is applicable to nearly all forms of internal combustion engines it is particularly designed and adapted to the engines of tractors and stationary engines where a constant fixed speed is desired under varying load conditions, such, for example, as starting a tractor from a standstill with an idly running engine, b shifting the transmission gears successive y into their difierent ratios to the highest ratio and. thus propelling the tractor under various loads due to uneven road surface or varying strains that may be imposed upon an implement which may be hauled by the tractor. 'Under such conditions as described or "any others which may impose a variable resistance upon the engine, the governor embodying this invention is constructed to so operate the throttle valve that the speed of the engine will remain constant.

The governor, operating upon the principle that the vacuum produced in the inlet passage of the engine increases with the 1ncrease in speed of the engine, utilizes the action of such vacuum against the throttle valve and by connecting a spring to such valve with a tendency to open it against the suction of the vacuum, the valve 15 caused to open as the engine speed and suction decrease and as the engine speed and suction increase the valve is closed. ,I

Certain adjustable stops are provided to limit the movement of the valve In both directions and the governor is so constructi d thatit ma be readily attached to the inlet means 0 an ordmar'y type of engine with littlepr no alteration of the same. The governor lsextremely simple in constructron and easy to install and it is provided with venous new and useful features of construction and arrangement as will'more fully appear as a more clear understanding s had from the following description taken n connection with the accompanying drawmi m which g. l is a plan view of a carburetor or mixing device of an ordinary type with a governor embodyingthis invention applied thereto, and ig. 2 is a sectional elevation through the axis of the same showing also a portion of the inlet passage to the engine and the governor and throttle valve in a position they would assume with the engine running.

.Llke reference characters refer to like parts in' both of the-figures.

' 1 represents the inlet passage of the engine which communicates with the cylinders thereof. 2 is the mixing device having a central passage 3 communicating at one end with the inlet passage 1 and open at the other end to admit air. In the device shown certain air restricting means are shown which form no part of this invention and the air is admitted through a right angle passage 4. In this particular structure the hydrocarbon fuel is sprayed'orinjected into the air in the passage 3 through an orifice 5 which communicates with the supply pipe 6. The partsabove described form a part of the usual equipment of an internal combustion engine and are of any suitable construction. In using this governor the usual throttle valve which is ordinarily suitably located in the inlet' passage and manually operated, is eliminated and in its place the throttle valve 7 is inserted, said valve being hinged to a plate 8 which is adapted to be clamped between the members 1 and 2 to hold it in place and is provided with a central orifice 9 through which the combustible charge passes. The valve 7 being hinged at vthrough the passage 3 and projects outside the mixer body through a hole in a removable cover plate 11 thereof. A control lever llllll dles the connecting rod and its other end is connected with suitable operating means by which it may be manually moved. The bifurcated end of the control lever 12 lies close to the cover plate 11 and is engaged by and supports the disk 13 which surrounds the rod 10 said disk serving as a. spring seat for one end of the spring 14 and a disk 15 serving as a seat for its other end also surrounds the rod 10 and is retained by the nut 16 threaded on the said rod.

By the arrangement of parts above described it will be seen that the spring 14, bearing against the seat 13 at one end and at the other end against the seat 15 attached to the rod 10, will tend to open the valve 7 to its fullest extent. This movement is counteracted either by the stop lever 17 or the suction of the engine against the valve.

The stop lever 17 extends over the end of the rod 10 and is pivoted to the pedestal 18 extending from the cover plate 11. An adjusting screw 19 in the end of the stop lever engages the pedestal and by adjusting the screw the end of the stop lever may be moved toward or away from the end of the rod 10 to adjust the extreme opening of the valve 7. I

The closing movement of the valve 7 is limited by the stop nut 20 threaded upon the rod 10 and retamed by the lock nut 21.

The stop nut 20 engages the disk 13 as the valve 7 is moved toward closed position and stops it at the proper position to permit the passage of suflicient gas to propel the engine under light load and at the desired speed.

By turnin the nut 16 upon the rod 10 the tension 0 the spring 14 may be increased or decreased.

The operation of the governor is as follows: assuming the engine to be at rest, there being no suction upon the valve 7, the spring 14 will open the valve until the rod 10 engages the stop lever 17. The valve 7 is in this position when the engine is started. Immediately the'engine starts it will again speed until the suction produced in the inlet passage is sufficient to overcome the spring 14 whereat the valve 7 closes, either to a .position where the stop nut 20 engages the disk 13 or until the spring tension is increased by being compressed to the extent of counter-balancing the suction on the valve 7. In normal operation, when there is no load on the engine. the stop nut 20 will engage the disk 13. When a load is put upon the engine and its speed is decreased thereby resulting in a consequent decrease in the suction, the valve 7 will open sufliciently to permit a larger volume of gas to pass to propel the engine at the desired speed. In this way the suction in the inlet passage automatically actsupon the throttle valve to retain it at the proper position to permit the passage of the proper'volume of gas to maintain a constant engine speed.

To increase or decrease the speed of the engine. the control lever 12 is manually moved and 'when the end engaging and supporting the disk 13 is moved away from the cover plate 11 the tension of the spring 14 is increased so that a greater suction and engine speed is required to close the valve 7 and the stop nut 20 engages thedisk 13 more quickly and holds the valve more widely open. Movement of the control lever in the-opposite direction has the opposite effect and decreases the engine speed. i

It is the intention of the inventor to provide the cover plate 11 with the parts mounted thereon so that it will be only necessary to substitute this cover plate for the plain one regularly furnished "and. to insert the plate 8 between the members 1 and 2. This, together with connecting the control lever 12 for manual operation and slight'adjustment of the parts, will constitute installa-- tion of the operation.

Although a specific construction and arrangement of parts has been shown and described it will be understood that various deviations may be made without departing from the spirit of the invention.

I claim:

1. An automatic throttle governor comprising, a throttle valve in the inlet passage of an engine acted upon by the suction therein to close it, a rod attached to said valve and extending outside of said passage, a spring acting upon said rod to open the valve. a manually operable lever having a movable end ad acent said rod and stop means on said rod to engage the movable end'of said lever to limit the closing movement of the valve.

2. An automatic throttle governor comprising, a throttle valve in the inlet passage of an-engine acted iipon by the suction therein to close it, a rod attached to said valve and extending outside of said passage, a manually movable lever having one movable end adjacent said rod, 3 spring seat adjustably attached to said rod, a movable spring seat supported by the movable end of said lever, a spring between said spring governor and it will be ready for seats and engaging the same at its respec tive ends, and a stop on said rod to engage 7 the movable spring seat and limit the closing movement of the valve.

3. The combination with an engine havmg an inlet passage and a gas mixing device attached thereto, of an automatic throttle governor comprising, a plate adapted to be clamped between the inlet passage and the mixing device. a throttle valve mounted on sald plate and acted upon b the suction in the inlet passage ,to'close t e valve, a rod m'raeae r attached to the valve and extending outside of said mixing device, spring means acting upon said rod to open the valve, and adjustable stop means to limit the closing movement of the valve.

4. The combination with an engine hav-.

,ing an inlet .pipe a'nd a gas mixing device, of

llO

an automatic throttle governor comprising, a plate adapted to be clamped between the inlet pipe and the mixing device, a throttle "valve mounted upon said plate and acted 4 upon by the suction in the inlet pipe to close the valve, a removablecover plate on said mixing device, a rod attached to said valve and extending outside of'said' cover plate, a manually movable lever mounted on said cover plate and having one movable end adjacent said fed, a spring seat adjustably attached to said rod, a. movable spring seat supported by the movable( end of said lever, a spring interposed between said spring seats, an adjustable stop on said rod to engage the movable spring seat and an adjustable stop mounted on the cover plate to engage the end of said rod.

lln testimony whereof I affix my signature.

HERMAN A. LEWI S. 

